Safety device for presses



S. W. SCOFIELD.

SAFETY DEVICE FOR PRESSES. APPLICATION FILED }APR.26, 191B. RENEWED'AUG. 16,1920.

1,370,369. Patented Mar. 1, 1921.

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SAFETY DEVICE FOR PRESSES. APPLICATION FILED APR.26, 191s. RENEWED AUG. 16. 1920.

1,370,869, Patented Mar. 1, 1921.

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S. W. SCOFIELD.

SAFETY DEVICE FOR PRESSES. APPLICATION FILED APR.Z6, I918. RENEWED AUG. I6, I920.

3 SHEETSSHI:EI 3- 1,370,369. Patented Mar. 1,1921.

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SHERMAN W. SCOFIELD, OF CLEVELAND, OER) SAFETY DEVICE F632, FRESSES Specification of Letters IPatent.

Patented Mar, 1, 19231,.

Application filed. April 26, 1918, Serial No. 230,877. Renewed August 16, 19%. Serialhl'mthtfififi,

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p known that 1 SHERMAN W. Soocitizen of the United States, resif Cleveland, county of Cuyahogo, and "etc of Ohio, have invented new and uselmprovenients in Safety Devices for see, of which the following is it speciitioii, the principle of the invention beng hereing eigplained and the best mode in hich have contemplated applying that principle, so as to distinguish it from other entices,

by im'enti n relates to safety devices and particularly to such devices adapted for u in connection with the operation of power presses. More paiticiilarly, my inion relates to a safety device Whose e hand of the operator, is disposed in to the of the downwardly 5;; press plunge. Specifically, the ape115 oroyides in cans furnishin a sai'et "foreign body, the shop power being led entirely independently of e. tr eadle. function of tie safety trip herein disis control ed by electrically-operated invention is illustrated in the operation of power he positive clutch type and -tic pin clutch type l v missed drawings and the following ion set forth i means, howev constituting but oneoii the one embodiments which the principles of my invention may be used.

annexed drawiiigs: lgure 1 represents. e broken. side elevaof a standard power press of the posiclutch t pe to which my improved device has applied; Fig. 2 reprea horizontal section taken in the plane indicated by the line 11-11, Fig. 1, the punch connected parts being omitted;

of the elements shown in Fig. 1; Fig. 4 enresents a vertical section taken in the .a'nes indicated by the lines lv lv, Fig. 5 represents a section taken in the lanes indicated by the lines VV, Fig. 3; hi 6 represents, upon an enlarged scale, elements shown in Fig. 1; Fig. 7 reposee: P: M,

(Jamel resents a broken side elevation of a stand erd power press of automatic pm clutch which ft. ctions only in the absence of detail certain means invention, such disclosed represents, upon an enlarged scale, a

oslOIl is to prevent the normal operation "e press when foreign body, such the arm 13 being extended seer-weirdly and has been applied; and Fig. 8 represents e.

section taken in the plane indicated 'bythe line .VHIVHI, Fig. 7.

Referring to the annexed drawings, Figs, 1 to 6, inclusive, there are disclosed the base 1, and upper standards 2 of as positive clutch type of power stamping piess pix vided with a table 3 upon which is mounted the die t adapted to cooperate with the yer-- tica-lly rec'iprocshle punch The letter is secured to gluing-er 6 connected to the crank shaft '2 a rod 8 connected to a crank (not shown), A continuously rotating iiy- Whee' 9 is coup ed with or uncoupled from the crank shaft '2 by suitable wcii hnown means, hereinafter more fully mentioned.

A guard 11 is secured to one end. of a pair of arms 12 and 13 which are pivoted upon studs 12 secured in the stmidsrds 9 carrying upon its other end :i dish. member 18, provided with a pin. 18" hereinafter more fully mentioned. tresdle connecting rod 15,; secured to s tresdleid which is pivoted atits reareiid in the hose 1., is pro vided at its up oer eiid with e. roller 16 adapted to contact with the arm 13- so as to raise or lower-the some, be readily understood, said treadle 15 sliding in bracket 15 secured to the st derd 2 and being normally held in its upper position by means of a spring 17 Whiwh is put under tension by the downwaid actuation of the treedle 10. The guard 11, tresdle l6 connecting rod 15 constitute a controlling e /ice Whose function will he hereinafter fill scribed, the ti'eadle 10 serving; no ot' pose and being independent of and nor com nected to the actuating me Iisnism which operates the press. which is carried on. the end of the rod 13 is adjustable upon the some through provision. of the slot l l. bracket member 19 is secured to the standard and provided with two contact lingers 19 which lie Within. the path of movement of the pin 18 of the dish member 18 and are "forced contact one with the other by the upward incvoment of said pi The clutch which operstively connects the fly-Wheel 9 and crsiil-r shaft 7 ordinarily cannot be coupled because of the provision of s trip mechanism consisting of the rochererin 29 restreiiied by the arm 23., e constmctioii furnishing e setety trip. A rochereheft 21 end roclieze The dish member 1% arm spring 22, which latter is under tension when the clutch mechanism is ineffective, ere also shown. The removal of the restraining influence upon the rocker-arm .20, o by means hereinafter fully described, will result in the actuation of said arm through the spring 22 effect the coupling of the crank shaft '7 fly-wheel. Set-id restraining member is represented by the "arm as stated, which its a trip dog and is pivoted interm diately of its ends upon bolt '25 which is mounted in a bracket 52% secured to the standard 2. Secured to one end of said m 28 is a. rod 28 intersecting the standard and connected at its other end to an arm 27 pivoted to the member 28 secnr cl to chose member 29 carried by the standard 2. Said member 27 is provided with a member or surface portion 27 which, upon the energizing of amagnet 30, is adapted to be attracted by the latter, against the tension of sprino 26', which action, through the arm 2?, and rod :26 will cause the clog to release the rockeocrm 20, as shown in clotted lines in Fig. 5. Donble Wires and from a lamp socket or any other suitable source of electric power are clisciosecl, one of which is fastened to one of the contact fingers l9, the other fastened to terminal of the magnet 30. A length of Wire is fastened to the other terminal on ro gnet 30, the other end of this listened the other con- The completion of the cirreaches tion that the crank shaft 7 to the i in-no. To V10 9 1. n lencewo er cot-11c untii u n coup s the heel 9 cannot he the ll re, the ction in the hand of meets with any cl; cl movement, such the the electric cnc. o ll11ll11g too will be c t which allows n the loci 3e,

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o the clotch i; o, the eve pin and the 1. me 2 cool the other rich connected to a reel M. in-

T' portecl by member piv up; el by two arms 27 in turn piv- 37 supported upon encl ofc energizing of the magnet 30 Will cause a towerri. said the independently of semi p ioroeoo member 28 connected to the frame 2 and supporting the magnet 30. it is evident from the accompanying chewing that the completion of the electric circuit and the member 27 mounted upon the arms 27 to be attracted by said magnet and this action through the arms 27 and rod 41 will rock the arm so and cause the trip 36 to be actuated so as to permit the plunger to eliect its downward movement.

It is very evident that the utilization of the principles of my safety trip allows the clutch mechanism of standard forms of presses to be utilized Without any change inv construction or relative disposition ct parts, the trip treetlle and connecting roci being dispensed with.

'What 1 claim is:

1. lo a safety device "for presses the comhination with the fly-Wheel and crank-shaft; of means tending to induce their normal cooperative relation; means including guard and electrically operated elements controlled by said guard for controlling the ifllIlCillOT'P ing of said inducing meons;,and means controlling); the functioning of said gnerrl.

53. in o safety device for presses the cornhinetion with the plunger and die and for causing the reciprocation of seicl pm ger toward and from said die; of it cletec device, means controlling the functlcnin of the letter electriccliy ectustetl means trolled by said device, and e. sofet trip controlling the functioning of soil 1 actuating means sna l in turn. contra said electrically operated Insane.

l'n safety device for presses, hinstion with the plunger and die,

the c hr the movements the guard and tii oin seitl restraining means to permit said p longer-reci roceting means to function. the tuncting of sci-cl; permitting means being entirely nclepeniient of the poorer applied l. to said treerile.

te in e device for presses. the 864 hinotion "with the plunger die means ecu: :ng recipr u plunger towers! and soicl v tecting device means for moving the lzitt gear, electrically. octoetetl moons contby "the movements of said device, and

trip controlling the ttunctionin pinnger-ectueting means and in t controlled hy soid electriceily-opere means.

5. In e safety device for presses, the hinetion with plunger, die, fly

crank shaft, and clutch for coupling said shaft and wheel; of a controlling device consisting of a guard, a treadle, and a connecting rod, said guard being moved downwardly toward said die upon the actuation of said treadle, means preventing the coupling of said wheel and shaft, a magnet, a pivoted arm adapted to be actuated byithe latter, means connecting said pivoted arm to said coupling-preventing means, the construction being such that the coupling-preventing means are rendered non-effective when the magnet is energized, and an electrical circuit within which said magnet is included, said circuit becoming closed upon the contact of said die and guard.

6. In a safety device for presses, the combination with the plunger, die, fly-wheel,

crank shaft, and clutch for coupling said shaft and wheel; of a controlling device consisting of a guard, a treadle, and a con- "necting rod, said uard being moved downwardly toward said die upon the actuation of said treadle, means preventing the coupling of said wheel and shaft, a magnet, a ivoted arm adapted to be actuated by the atter, means connecting said pivoted arm to said coupling-preventing means, the construction being such that the coupling-preventing means are rendered non-effective when the magnet is energized, and an electrical circuit within which said magnet is included, said circuit becoming closed upon the contact of said die and guard, the resultant actuation of the plunger being entirely independent of the power applied to said treadle.

7. In safety devices for presses, the combination with a fiy-wheel and crank shaft of the press and a holding device which until tripped is adapted to hold said shaft out of operative engagement with said wheel; of movable guard means, means for effecting said movements, electrically actuated means for tripping said holding device to allow the engagement of said wheel and shaft,

said tripping means functioning only when the normal movement of the guard has taken place; and means effecting said functioning.

8. In a safety device for presses, the combination with the plunger and die and means for causin the reciprocation of said plunger towar and from said die; of a guard,

means for moving the latter toward said die independently of said plunger, said guard being caused to reach said die in advance of said plunger, restraining means preventing the downward movement of the plunger, electrically actuated means for tripping the restraining means, said electrically actuated means becoming effective upon the contact of said die and guard; and means for causing said effective action.

9. In a safety device for presses, the combination with the plunger and die; of a guard, means for moving the latter toward said die independently of said plunger, said guard completing its downward movement before the plunger commences its downward movement, means for effecting such plunger movements restraining means preventing the downward movement of the plunger, electrically-actuated means rendered effective upon the contact of the die and the guard for tripping the restraining means; and means for causing said effective action.

10. In a safety device for presses, the combination with the plunger and die and means for causing the reciprocation of said plunger toward andfrom said die; of a guard, means for moving the latter toward said die independently of said plunger, means rendering the plunger inefi'ective, electricallyactuated means adapted to nullify the restraining action of said last-named means, and means causing said electrically-actuated means to function at the moment of contact bination with the plunger and die, means for reciprocating said plunger, and a suitable table for said die; of a guard movable toward and from said table, means for effecting such movements independently of the plunger, means rendering the plunger ineffective, electrically actuated means adapted to nullify the restraining action of said last-named means, the construction being such that an obstruction in the path of movement for said guard to said table prevents the functioning of said electrically actuated means; and means causing the latter to function at the moment of contact of said guard and said table.

Signed by me, this 6" day of April, 1918.

SHERMAN W. SCOFIELD. 

